MKS Ophir Spiricon BeamWatch Standard Quick start guide

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Ophir BeamWatch®Standard

User Notes

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Dear Ophir-Spiricon Customer,

Thank you for your recent purchase of the BeamWatch system.

At Ophir-Spiricon we strive to provide the highest level of leading edge photonic measurement technology and service

possible. We hope that your experience with us is a pleasant one, and anticipate the relationship we build will serve your

photonic measurement needs for years to come.

As a valued customer, your comments and opinions are always very important to us. If you have any concerns, questions,

or comments, bring them to our service department’s attention. We are ready to help with everything from basic setup to

working with you to find solutions for your most complex photonics measurement needs.

Please let us know if there is any way we can be of service. Thank you once again for your business.

Sincerely,

Ophir-Spiricon, LLC

3050 North 300 West

North Logan, UT 84341, USA

Tel 435-753-3729

Fax 435-755-5231

www.ophiropt.com/photonics

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How to Use this Guide

Symbol Notation

Indicates general information that poses no risk.

Indicates important information about the product with little or no risk.

Indicates warning information. Failure to follow instruction may result in harm to the user or product damage.

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Safety

While BeamWatch itself does not present the user with any safety hazards, this instrument is intended for use

with laser systems. Therefore, the user should be protected from any hazards that the laser system may

present. The greatest hazards associated with laser systems are damage to the eyes and skin due to laser

radiation.

Optical Radiation Hazards

BeamWatch is designed for use with high power lasers and therefore safety precautions must be

taken. Users must be protected against accidental exposure. Exposure to personnel other than the

user must also be considered. Hazards include direct beam exposure and reflected radiation.

Protective eye shields and clothing must be worn.

Electrical Hazards

BeamWatch utilizes only low voltages, derived from the Ethernet and camera power supplies. Thus

there is little risk of electrical shock presented to the user.

When installing or removing any hardware from a PC, the power to the computer should always be

disconnected.

The computer should always be operated with its covers in place and in accordance with its

manufacturer’s recommendations.

The computer should always be operated with a properly grounded AC power cord.

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Chapter 1 Information

1.1 Introduction

BeamWatch is the laser industry’s first completely non-interfering beam monitoring system, which allows beam

measurements without contacting the laser beam. Measurements are taken by imaging the Rayleigh scatter of the beam

from the side using conventional cameras making BeamWatch ideal for measurements of high power lasers. Ophir-

Spiricon has measured beams up to 100 kilowatts.

BeamWatch provides simultaneous measurements of multiple profiles along the beam caustic in the camera field-of-view

(FOV). The speed of measurement operates at video rates allowing for real-time determination of:

•waist (focus spot) width and location

•focal shift

•centroid

•M2 or K

•divergence

•Beam Parameter Product

•Rayleigh length

•relative power

Real-time performance also allows for measurement of dynamic focal shift during laser startup.

The technique is based on Rayleigh scattering of laser light by oxygen and nitrogen molecules in the air as the beam

propagates. Measurement of this scattered light provides an equivalent slit scan of the laser beam in the direction of the

view observed. The scattered light is measured using conventional CCDs and image capture systems.

BeamWatch has GigE connectivity to standard personal computers for data acquisition, analysis, and display.

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¼” Polyurethane tubing 10ft

BeamWatch Standard

Alignment tools

Ethernet Cable 4.5m

Gigabit to USB 3.0

Adapter

Power Supply Cable

Power Supply Adapter Kit

User documentation:

•

Alignment tool User Notes

Calibration Certificate

Gig-E Camera User Notes

Quick Start Guide

BeamWatch Software

Installation Disk

1.1.1 Equipment

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1.2 Optional Equipment

Additional Optional equipment (Not Pictured)

We recommend one or more of these additional products.

•BeamWatch rotation mount (SP90346)

•Locking Ethernet cable (SP90394)

•10kW water cooled power sensor

•30kW water cooled power sensor

•100kW water circulated power sensor

•Juno PC interface

Consult your Ophir-Spiricon Representative or call Ophir-Spiricon’s Sales Department for ordering information.

1.3 Specifications

Wavelength

980 –1080 nanometers

Minimum Power density

~2 Megawatts/cm2

Minimum Focus Spot

SP90390

SP90391

155 microns

55 microns

Maximum Beam diameter

at entrance/exit

12.5 millimeters

Communication to PC

GigE Ethernet

Power

12 Volts DC, 1.67 Amps max

Particulate Purge

~10 SLPM (35 PSI / 2.5 BAR) Air,

Nitrogen, or Argon. 1/4" hose fitting

included.

Camera Field of View inside the BeamWatch unit

SP90390 (Dual Axis)

32.17mm x 8.55mm

SP90391 (Dual Axis)

11.26mm x 2.99mm

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1.4 Operating Limits

The graphics below are intended to give a visual indication of the recommended operating space for BeamWatch. If

BeamWatch is operated outside of this space, it may be more difficult to see the curvature of the caustic or the beam may

be large enough at the edges of the image that it is out of focus.

•Optimal has at least 3 Rayleigh lengths on both sides of the waist, with the waist at the center of the image

•Near Optimal has at least 3 Rayleigh lengths on one side of the waist, with the waist at the end of the image

•Acceptable has at least 1.5 Rayleigh lengths on both sides of the waist, with the waist at the center of the image

When using these graphics, take the M2 value and

reference it against the waist width of the beam.

If the beam falls within the plotted areas, then it is within

the range for BeamWatch to give stronger results.

Use caution as the beam falls into the Acceptable range;

these results are not as strong.

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Power density also plays a role in the operating space. The chart below shows the required power vs. focus spot size for a

top hat beam.

The equation to estimate the maximum spot size is derived from the power density equation:

  





   



Where Pave is the average beam power and AD4is the area of the beam at the  location.

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Chapter 2 Hardware Configuration

This chapter walks through how to setup and start using your BeamWatch.

2.1 BeamWatch Standard Mounting

The BeamWatch unit must be mounted to a stable surface where

the laser can pass through the entrance and exit apertures

unobstructed.

The center of the entrance aperture is located 50mm from the

crosshair marked on the top of the camera (see image right).

Position the BeamWatch unit at the nominal focus position along

the laser axis, and make sure the beam waist is as close to the

camera axis as possible.

There is a scribe mark on the side of the camera that references

this position. The calibrated distance from the top of the

BeamWatch to the center of the detector array can be found on

the calibration sticker.

To obtain results within ±5% accuracy, the camera must be

aligned perpendicular to the beam with minimal tilt (<5°) in all

directions and the beam must lie in the plane of the camera focus. Use

either a translation stage or the laser robotics to facilitate the

positioning of the beam in the camera focus plane.

Once in the desired location, secure the unit with four ¼-20 or M6

screws in the slots, two on each side. If not mounted in a fixed position,

measurement error and/or damage to the unit may occur.

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